Non-repudiation
... further development of networking , the concept of e-commerce came into existence . It is used for buying and selling of commodities required in day-to-day life over the internet . This might sound easy as we get our desired commodities at home on clicking the mouse , but there are various crucial security aspects associated with it . We use security services every day in our workplaces and society has established an intricate set of laws and customs surrounding the use of these security services. For example, if we need to identify someone, we ask him or her to appear in person, perhaps with some credentials. Or, he or she is introduced to us by a common acquaintance. If we need to send a paper document securely, we wrap it in an envelope, a double-envelope, a sealed diplomatic bag, or a strongbox. And, if we need to enforce access to buildings, rooms, facilities, computers or information we do so with locks, keys, combinations and guards. We verify the integri...